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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ad130e05be84693f649a9968bcb7b903900d635bd5451aba450cdb56dad80d3' 
  AND token = 'OnpMShX9pf7uLHwT7GEsI8srNslAgcoFr7Xs4JDGSIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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