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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ff001ce8629e3ded0705b75563e8a6c2d2ab6a27513bf771668eb32132b4101' 
  AND token = 'ZbRV5MLkks585la2YZUFlRwy1j1BUtyoVpeWWnUjdvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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