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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '022ec6bb1795ea82ec4de20ead5fca23671ba2a4483abd83f2edebe77c00e56f' 
  AND token = 'RiJVP52ajrURiqXI3Rv4EripFfCUzrXrcmapmQ/6+RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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