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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '132bb2c996465e30344410b317d225dc4a20e614cdbafb83797a95eda4bfbfde' 
  AND token = 'Rmp3G0JZaD09i8bY2bcvYfp0X4ukAkWpN5E2s1p4WNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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