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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67ef542917c439ed725a0a33c4f4c2395913f6199de2e8f229b1efa2bcfe09ad' 
  AND token = 'DSSXEXWEPtElxNL4YvNWyTg7kSBAKM9y6qLsEv5Md3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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