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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43296d32cdc4aee8b1c6f7bf6257e5154743c26d9cd2a51da08c7a474f4ab30a' 
  AND token = '0AKH//gq2KlNoN8b8dglVAE7cEDxlYbibAQU+71Y/to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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