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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb939fec887f3b82efeab96f7bdfb993aea6e59bb321a77090babf2220f66e8d' 
  AND token = 'vv2+/4vaYSeNVXc7O6Xywpdo+VRFGz6KYajf0+Q2vFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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