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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61d4eda3cc3b6c84296e7b5658b95925f2cdc09d05412222af8c81c5e4b75935' 
  AND token = 'g28MOrbA3yoEvxGMWxi1rJX3bBQwZDwKH818UcvSOhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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