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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a1aa9da109d575bf73ea15a19116408374d7616ea4f627fa8d347a21e560934' 
  AND token = 'D2jMGTf/lwV13EMtSvyiVuK2BdHlN5uTqZJdoZwgq/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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