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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20936a928540bbcd5c50caf9bd747cce2c675587dc3969234a0d46603865868c' 
  AND token = 'HtXcRRrX2YoDKKI4z+PvuW9KsELd76VhuIE6rhPLPrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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