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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524cb9794ae95e1824475a1c8be57b0da8477c4eea0d2c9aa9ff60a05cadbcf5' 
  AND token = 'oX4BzuQ4xD7B+utV12/ZuhZtqKmOFRbfXj/Zf/FHKs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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