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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e539fab17cd1b4fd864c5e30ea7ad8f2609b18c92cffa59c75bf9d65e6969303' 
  AND token = 'BErxrPRHTBDIgmU6sAFUjQE6kEhJF9cG6+5dARZdmrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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