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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4697f1b4af543d2b78c843973363f06e6fbd556a9d3ea91ff7e6334d9234f37f' 
  AND token = 'UgqtmMv5SuDz+avF+vFLpY7e42tCHaydIO6qeonq2iM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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