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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3feddb282c91f12872844b95b2a88c6228e41f9f1c44c865403c03aa99e54078' 
  AND token = 'Z9kphCtufNTmduFnzzpHcB6U512ThBuW6UgSVit0TFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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