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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aef87ff6e86798a1980f0da507b622db86211dd34e23a92c107b9665a2830f4' 
  AND token = 'f9pE8sstCzY73a9J5R8S/mOyYzdkhmk2WSODVI8FI9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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