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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92cc843f284fa7d1d7860926af5d8a4190c73eeab1c903b9e7310d50b7d2edde' 
  AND token = 'GtV3EQuZWIv70dEul9Ke2a/N1irp9KFHWqQvsnptDUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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