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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '090628fdfc8e5fc9b901281903fe53617486b254138af182a358a92a648a8616' 
  AND token = 'kpWSkv3fK0Twq1A2Qvs+iTLMpwfkk3sq2Xf2YOc0uD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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