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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd029e5396ee27246f045f6d44cd45ffdd18b5a5c655c08db1ff3e4e211d69b3f' 
  AND token = '1vTefACUAv4c7u9dxaiYHG1sCYiaHxX//FdWOp37U6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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