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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06de984483a2bfd721e64d56c53fb03853041a6e5463bf1954a49a8b76345903' 
  AND token = 'kgvrhvgA/DEkA7seU1rzdCFcHwQxewt2d771tqeaOcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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