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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88acda0149c7aa47d2dca0f49b4fa2e436d5c7a68d7cd5b138cab82a4a50f92c' 
  AND token = 'QDo8kMuhAs22yVK1ji8CbKuXWdohyLgRc9It3qbWgDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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