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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dae01e26572fc60c957f48c7fff49fec49a4b58613f132c8b70902958bce9be' 
  AND token = 'mBQE8ZjdYuEaMwCe2ww9+yK+YjtwblnCAiMS8HUQ3/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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