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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '048de12c852a30cfaf951f615ac4d3a06d0ce44c0697a57c0c3735d1cd1ba25c' 
  AND token = 'bSmApCHieaWFl4waGIxZwQqIREQtd4zp33pwr4wFhM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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