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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '057f91b9664e23da9403bc16e89f94c468b58c4a5f03516ce01167c20176dbbb' 
  AND token = 'ahWZXAnNXt8kP2HEdT6TYxYWp5U1GsSt1/JOpBCcLek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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