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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '394b1818094a4e333e94d0b090eca4a3decd853efb6e0693f25d10dae88c0ec6' 
  AND token = 'PqYOyE0KXl4X5ogzC6nsK11gclUhoUeTal3thB1LjP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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