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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4038e4efdd6945df846552fe479dc773a40d00b4549c48d628c5d2d688e18109' 
  AND token = 'AcwFVxpZAnSe4fIqfgfJpDu3gh2Vtz3ySgGaJ7KJG8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00095

JSON explain

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