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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '868b8f73586bcd3fa14c891e3d8bdc9b4cf347ba4ad8f5b31b623d6de4a918db' 
  AND token = 'R8VW7UnPateEM5AapHal4sJ0dgR9MJ2P3vSOeHYtXw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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