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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b6c14392422b4a7f0cc2d458c4a5102b1f8cbc5a8e00441b44ea7f2ebfdc56' 
  AND token = 'Yj91uZKjv6HMPd35y+y7lg6HSDd/B5oQXCme8+iSM0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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