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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfe7e480f97be0d82a8f56cf9873602b80870df4386a6f47960f9cd87227afd6' 
  AND token = 'oh0lfXnInJ9ac9ToKcxi2iExQ1abL6dJKFFYVK67kms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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