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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29c349b2970a30508a66ced4a4df0232b47f7f82f300783ace2a58879b527523' 
  AND token = 'SpF0iPYIb4HSHcchcw1Os9K416+FTa+Wi7tzMNG3n0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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