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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7561d68f766ed9c967f72b5d8af48879fd60ff9a0bb6b9c63e3f4ee3803e6395' 
  AND token = 'W7Sw3x5+AQ0PjRnYh82EhvvYt5Lq73FeF1VYuMI8Ymo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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