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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa84639da7dd9c274931e3668117bf3b2b84a4b172f2178c538b7841a80fe5c0' 
  AND token = 'Ts9gUt4egaO8btlU2IH5viTNxtf63uKn4y6my0bt4oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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