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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53e712f58ba6c26eef2ed71627ab91e559e47b254db11aef161499db80301aa1' 
  AND token = '4uNDlJuYrD4zwEib3RYTpA+oncMjs87BO0Gz9iY5P30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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