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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72a0da9f69c6f47c6f31938ccf187d8f7d2eef718cc8946d4cae74d9837de6e4' 
  AND token = '0zQQF6ir0P7LegHRKpFjldo0GZ4TL8mXKbIfkia/bew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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