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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa6c5305656543d9798674c9a7656c3e2ed35fb912f19b58fa5472f6596f5071' 
  AND token = '1fFyQTzZd8O96e4nma87udAHUum6wi+lW47RtbeTKqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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