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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d9e4442ba4a301da98e6939ab09563a476d46767d5d711486687ddd8b5b7322' 
  AND token = 'olg/p6AEvoOpGsHqd/YiZ1tb0Y9liDjmriEkwD85fjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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