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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '387b39cca3035e64e79781529a06202376c698cc7cea8b89ab238dc6d09410df' 
  AND token = 'oagycoQ7WcyaUXp/GfdvihAAImGj7ddNSwn+zofjdSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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