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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4559b0e46d0c9ec0fa895f18350838f5b702cec9c0581a6a191bd2398c0befba' 
  AND token = 'yrmHqheMyixUP1j9NClV3zD9ZrDEmyYq5cX4DHJ2NQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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