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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ea3971f540568555359afd8ba1f90201ed648b8089d6cb5c8d897b5a87d822' 
  AND token = 'cDyqh6Ze0viQFpdu/luekE6+X6XaOJTOWZXITJWvoQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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