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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a366a924094b2462b533451836de9588bd609b6495e7817c5a4f9534a9e8969c' 
  AND token = '84QxpVxhUwFsXhkMZh78tL5uJOzXrWuH3A8oanac6Ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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