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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '830ed63bb859e6c92e36ccec01be0f8f0067ee15a034637e0c913e6928eca077' 
  AND token = 'tJyqWww4bOIQCs81qJH67kwN6w0uliUALuXdSIlQils=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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