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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e31d1fe063ab2f767aa4ae516ceb6346646963b60e3ef81e86582a85a4a3ac4' 
  AND token = 'p8NSMZarVmxx4VdKh1P5dyXnq92vEspWAnR4H8ZnM9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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