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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52b49dcca8aa1f557eb7f5076a50a121525097d9e9e061be7935f2dbf58d8fbe' 
  AND token = 'zm0oTj9yXqk9/3qK8mCCC+Mx6ftym+glszMXFtD1NBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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