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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45355a16bf4d992856ccd7451c59c57cf672f0c88e6ae4859ecb7233189e99c1' 
  AND token = 'tur5AC1RybqGRCb3sS1vBj8uvKPX5v/ysgbG4cpBctU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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