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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4d89477f3932a1eb83ef8324477a5ac7ad84cb24549d31f7bc0c0cb0e515b95' 
  AND token = 'uEtftqAWAEX76BrUP4D/+p/fOaa3M4g/VAYWETgnMQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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