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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a23c04c646f60a74396aff157b6c4ebf40388dc6b240a03d3c32ffb2301c3b0' 
  AND token = 'MJfmJPAN6DA5S/NZ6Kjz9siZZcxKnSdm8M63rgPmLao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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