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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ffb5ab5f39395338ec3d4f25f3fa10eaa9983677650eafaa00139db6d31d5b9' 
  AND token = 'P6BkrMaoZg3velXq4m5itB1k9WbE0ifqaZLXjl+K2ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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