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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f76b62a2b5214d761a4f48009ff2a1b10ba7afa5517fa2f9febbc553b89693ee' 
  AND token = 'tG41U7TyCD8yK7qFIifwDJLiqjmBg6e4G2+eJR2D6E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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