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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d6c2f322e8dca92f3dfaa1c9f07748bae2389d628af96a5b6c15ce596189d65' 
  AND token = '/HecL4xY5p6PD7+WIvVzC4pyksTS+ZdxR1qntE//SYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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