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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '793c4e9f7c7a906c3248e840128271562871699abe433132452c09e8ae9118db' 
  AND token = 'UcAzV3oxEntvBRN/+GjeXpz4Wo8Hkz9Qgi4Jdm2qCHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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