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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd44d571a510a1116ec57c872deac204c6b50d12d2e10770ebbe6e15614354db0' 
  AND token = 'c+0KeNO/xYU9O/EeDZHX/mlCCZ/Y9sRyOmPmJc3zNuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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