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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c06815a07741156df7bec1e9ff947c81d1a8f122445d036854b93c7cadbe11d' 
  AND token = '/oXsXZVEaM3Gb2rc28t7JpUwYe4OuQNwNjDPXQ6vFeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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