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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '473e54016fe80c42b1c9ab9a77f89e8e15bc19f72e04cfac1aaf68ff42f95838' 
  AND token = 'pTuowPkLDx3wFgB974eMAZPzk2wQjen6WSM2aIFbV4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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