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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd7930f7f48b869cc572578f8ee3b9ed5858f05639cd2cd1f185babffd3cd621' 
  AND token = 'AWEzqE8BU4qz2LUQEoAysl4ls9+UArNcTOfIW8Iz0PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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