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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '955875e86833d843be9ccfb75753f214ed5760605663a0d02e814db1e1b843d1' 
  AND token = 'XkXvsA1tLGcVbi7EsAylX644BXE0g2iaAwCASSupNfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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