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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860430eb85e70789add159c46c76c5cad5eb4a9ddef4fa13f3c46662d68955c4' 
  AND token = 'IMFs2YK9faCvf2ktZ7r1Ku6hcxQtTm+HS9IafDPeE+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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