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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28bffbee323e6444f4f66e3fc8401e781127d9ad0fbd238e107eb83f1ffa6867' 
  AND token = 'G91aCEP8/qHPyWCbscinnCRQC93JeI+LUIMl3YVfEYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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