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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38408dc83bdf8614b05b66555ef9800140d9f231928dec2921915372650427e6' 
  AND token = '8aC3Az/ocOSj9vyS9pXlxV2bjkIY/weLM4sUo0gwLLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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