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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b261d047a07f9d1e376476539e4278f23b0d5f2bb29d495980080db867fd11' 
  AND token = 'OToC/4isQ9pelgOoRvLKZeHCFfUE0sIvQ6KPbF5I6YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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