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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c4ea082457690305a8bfd5087bdb1b821ca3943b1d14fb8accefa06fc85dbc7' 
  AND token = 'D5AyoA3kOd9NnpCV0QaDaj4UUvKFIjv1A/STGo8BueI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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