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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2537d4af150b370ed01aece0601807c94afbd3a7e7b2cceb3d98edf061223442' 
  AND token = 'Jq0z+6C1Ap3xbxorFQBZ7ABDYfenzdwA6XJYCvl8A1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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