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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f74169c9cab911c4e28f18df8b3a76d39f3e071b90ec479202bb8d4674b5b8' 
  AND token = '9at4mMU/RsJriT5ajfCHcfE7Iyr39UnH2380Jd78zWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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