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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7aaca4cf1fd8fffe6cba0f0a8409b17812e69679c0dfc8fd34f037a06085843' 
  AND token = 'k9GBOZMjEB8z+flNN2O46uguRj/iXP+H+bt6g0IGsIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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