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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3633cefe5ec811da337aab22bc1c25620ddd56ecef7048e431037eaebdbe4eee' 
  AND token = 'js6U/sZj589AERCQq+zV6A6B4E+SVie9LFV7/SihVX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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