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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '201197b2f3fc38f61c3a3ff8f7a9baa2ac7112773546a06536f5953fd7d9b7a7' 
  AND token = 'Orto0Eo6WlvrnhoOTcuXVx0Fpn5rz52pdkYYwYR8/1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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