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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b16f7d1d27bf2d7e0352230493010d0910003b11413422e501b6cd547ce2a22' 
  AND token = 'pGtULF+YJ8BarNoUO8KVHNZOF6g0+F/DX7TsmJztd5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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