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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f9d2674d5fc216360f98a705ca2df6d77a6a89461e57baebcb4ca2290617004' 
  AND token = 'Zo32AxIlmrjXyUh4FrybpXUP+cNgkuGY4BsB49thRBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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