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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '490ae512d26371133048f267e6fc51261a75bc0ba77be9cd242c8ce3d7192d6f' 
  AND token = 'iuezpAt0HcKH8JorvU6RbKMU/acCrG+5VU0xEf9Jpbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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