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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ad6926bf09f7ea592293f64a88b5838d12cba18ba1ffc2a57aaec8713a2ba02' 
  AND token = 'gVhKK9likfgsMA73TJf1e67MJWC9LGtMIRy+7g3Kl1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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