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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bf849f4c89a6477c7e0558a797582cadf8ae06983b679d3e64d3ad28174e6f4' 
  AND token = 'LwXEcJEEmZ3T0/cSaOGieFAzBGbOXVHh3jUa6izbRYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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