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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea595114286ed15fb704c70d8bae29b70515eed36d6dd7b5f5677a640b081ce5' 
  AND token = 'q51bN7Pv5ur21y/3G0wWdLcKwzWGdxZ6sMB1cyXB/jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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