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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba3ce161f8b98c5acbb4654e56caa139a16b652e34f5e6704a7c8e3b8cb8fcfc' 
  AND token = 'WLT9ctnR/efkt9bn8erUGSnAevfTGIsmEGNiAV5ZGOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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