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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1a53de31cf0e385d4de01e77d91b60334ead5e176670dd73ad71888bf40c607' 
  AND token = 'tle+8NomqVG/XM+aw5upqp0zMTf/nWSyC5m9Pt7Fisw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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