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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f604a2be7b31accc97f7fddeb93fb01f99e0cc39c62eb95340ef7f9d7aaa7baf' 
  AND token = 'UKgFIbIzvd2KgLVHu2WiIumUdiukGJrDh4vonVhV7QU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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