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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66321ad0e609e6de771dc4199517dbac449b68eaed8f4cd42d7768fca5f0cad9' 
  AND token = 'RKcju31hParptXB+AdOKSn/6iqPMjvgXnOJp4S3/nAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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