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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9cc520b19df21418098a5b40f88c1ef84995c875d6c49b74841ab7b41acfa85' 
  AND token = 's+2/h8BbR5Q9JmhtGPft2Ul8YdX0j42jfIaijGWsP5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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