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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bd7730457e1a9caf31299b3266853ad98250372c75747176e62da36477eb73f' 
  AND token = 'MxTrsEiJd5LBjQoEw0o14zba7Ylq5iwCvmeuNp5q8EA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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