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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a97583a62ca84523c4d75cc41851f4fb3074b9c9e36b0ab8f00266d34ede2cd6' 
  AND token = 'tM5M4YUZO7mvdpXWfsi/rJYtM1ie9RCngx7bSk+dSNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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