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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61dd8eaee54b5a2d2a71a4e9fbefef0f9a9816e873110a59a9f97b667c553001' 
  AND token = 'MiisgAPCtucoGiLkRH9hbxRJwlJ+AMxd1DIckOL95Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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