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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63e56908b7d5a85fd49f3fe183bff969a126872c356baee678cad8bd5b990d0c' 
  AND token = 'DaWeYUk4h40pky38FGrYxOUqYbD2+naaPbkYchYEpnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}