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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25f1316478fbf6adf6f337908117449da397997f9e3af6bfea78b96cda5d389e' 
  AND token = '6urj71uYg3+jArKHbmwWKTaFTChh8Qqd1vg3LR8fxrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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