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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98617f0bdd16eddef5ea2e8ec8f5d9f2f04572b6b23cf50f9876d1d99916611a' 
  AND token = '9qeUwekgJhGnvb4JFY5D85A2OorkvfmNRmzeemM8Zc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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