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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce8247f06f682f6b684f61748f8a872feec74ccbb7cfe9ec0ff096b184cda54' 
  AND token = 'sB+Zqqj/2SupgOOHmwIzP2GwRAOthZqeNCFSXtFXD20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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