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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11bce66596dc83cda387716f9c0c910f3e6f878b1f1ddb96e699aa3af98c9cfd' 
  AND token = 'GYb+pl4V3RysPKKYex91jHdbFP3BOMXmtrFZoicV4+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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