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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adfa7c4f16effad2d3549d6bace862e4031b0b73f8c901a126b520e56fa043eb' 
  AND token = 'ITdM5Ep3uEaW7VKp0YAXRO30IAMQkx+i3bjU1rQT1Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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