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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0713b356a8a7505b20876daa674c8ba6bec60b9931cf577ec084b24f32d190f7' 
  AND token = 'UAk+kKkj8QcS82JJF/7VGWnMHu5KsMoleXmSygmF5Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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